Obama and Romney’s promoted Twitter tweets backfiring via #hashtag hijacking? A decent chunk of the responses to each promoted trend have been exactly the opposite of what the buyers wanted. Read about it on Mashable >

Digital Platforms & DevicesWal-Mart is testing a system that would allow shoppers to scan items using their iPhones, then pay at a self-checkout counter – a move that could trim checkout times and slash costs for retailers.Read the Reuters article >